U.S. patent application number 14/429725 was filed with the patent office on 2015-11-05 for method for arranging jet cleaning nozzles.
The applicant listed for this patent is BAOSHAN IRON & STEEL CO. LTD.. Invention is credited to Mingnan DUAN, Shanqing LI.
Application Number | 20150314337 14/429725 |
Document ID | / |
Family ID | 50297671 |
Filed Date | 2015-11-05 |
United States Patent
Application |
20150314337 |
Kind Code |
A1 |
DUAN; Mingnan ; et
al. |
November 5, 2015 |
Method for Arranging Jet Cleaning Nozzles
Abstract
A method for arranging jet cleaning nozzles comprising:
arranging multiple rows of nozzles in a parallel and uniform manner
along a lengthwise direction of a metal plate strip; arranging the
nozzles in each row at an equal interval; arraying adjacent rows of
nozzles in a staggered manner along the widthwise direction of the
metal plate strip so as to form a nozzle matrix; wherein each
nozzle is perpendicular to a moving direction of the metal plate
strip, and the perpendicular distance of each nozzle to a surface
of the metal plate strip is the same. Through the method for
arranging jet cleaning nozzles, nozzles can be flexibly controlled
based on the change of the geometric relationship between nozzles,
in order to implement efficient and continuous descaling on the
surfaces of a metal plate strip with different width specifications
and different requirements on the descaling speed. In this way,
waste of energy and water resources occurred when changing
specifications is avoided, and the phenomenon that upper and lower
nozzles spray to each other is also avoided, thereby achieving
flexible and efficient control over the arrangement mode of jet
cleaning nozzles for descaling.
Inventors: |
DUAN; Mingnan; (Shanghai,
CN) ; LI; Shanqing; (Shanghai, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BAOSHAN IRON & STEEL CO. LTD. |
Shanghai |
|
CN |
|
|
Family ID: |
50297671 |
Appl. No.: |
14/429725 |
Filed: |
December 5, 2012 |
PCT Filed: |
December 5, 2012 |
PCT NO: |
PCT/CN2012/001628 |
371 Date: |
March 19, 2015 |
Current U.S.
Class: |
29/890.09 |
Current CPC
Class: |
B21B 45/08 20130101;
B08B 3/02 20130101; B08B 3/022 20130101; B21B 45/0275 20130101;
Y10T 29/49401 20150115; B08B 3/00 20130101 |
International
Class: |
B08B 3/02 20060101
B08B003/02 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 25, 2012 |
CN |
201210362387.6 |
Claims
1. A method for arranging jet cleaning nozzles comprising:
arranging multiple rows of nozzles in a parallel and uniform manner
along the lengthwise direction of a metal plate strip; arranging
the nozzles in each row at an equal interval; arraying adjacent
rows of the nozzles in a staggered manner along the widthwise
direction of the metal plate strip so as to form a nozzle matrix,
wherein each nozzle is perpendicular to a moving direction of the
metal plate strip, and a perpendicular distance of each nozzle to a
surface of the metal plate strip is the same.
2. The method for arranging jet cleaning nozzles according to claim
1, wherein jet flows of adjacent nozzles in a same row have no
mutual interference.
3. The method for arranging jet cleaning nozzles according to claim
1, wherein in the lengthwise direction of the metal plate strip,
jet flows of adjacent rows of nozzles have no mutual
interference.
4. The method for arranging jet cleaning nozzles according to claim
1, wherein in the widthwise direction of the metal plate strip, a
separation distance between nozzles in each row is 2a; and a
separation distance between nozzles from two adjacent rows of
nozzles in the widthwise direction of the metal plate strip is
a.
5. The method for arranging jet cleaning nozzles according to claim
1, wherein in the moving direction of the metal plate strip, a
separation distance between adjacent rows of nozzles is b, and a
value of b satisfies non-mutual interference between jet flows of
adjacent rows of nozzles.
6. The method for arranging jet cleaning nozzles according to claim
1, wherein when a width of the metal plate strip in a production
line changes, the method further comprises: in a vertical direction
of the surface of the metal plate strip, setting a moving distance
as .DELTA.c; setting a direction moving close to the metal plate
strip as a negative movement, wherein a value of .DELTA.c is a
negative value; setting a direction moving away from the surface of
the metal plate strip as a positive movement, a value of Z is a
positive value; wherein the following formula is satisfied:
.DELTA.c={[(L.sub.1-L.sub.0).times.ctga]/n}(1+K) wherein:
L.sub.0--a basic width value of the metal plate strip, mm;
L.sub.1--an adjusting target width value of the metal plate strip,
mm; .alpha.--unilateral divergence angle of jet flow symmetric
section of the nozzle, which is determined by the property of a
nozzle, degree; n--the number of nozzles of two adjacent rows; K--a
compensation coefficient of a jet flow characteristic of nozzles
-0.5.about.0; in the widthwise direction of the metal plate strip,
each row of the nozzles has a central line of the plate width as a
symmetry center, and when the nozzles move close to the center line
of the plate width, a distance between adjacent two nozzles in each
row changes with a variation 2.DELTA.a, which is satisfied by:
.DELTA.a=(L.sub.1-L.sub.0)/(n-1).
7. The method for arranging jet cleaning nozzles according to claim
1, wherein the nozzles are arranged parallel in more than one or
more columns along the lengthwise direction of the metal plate
strip, so as to form longitudinal nozzle columns which can be
adjusted respectively.
8. The method for arranging jet cleaning nozzles according to claim
1, wherein a jet flow divergence angle of the nozzle is:
0<.alpha.<45.degree..
9. The method for arranging jet cleaning nozzles according to claim
1, wherein an axis of the nozzle is in a plane which is parallel to
the moving direction of the metal plate strip and vertical to the
surface of the metal plate strip; and an angle .beta. is between
the axis of the nozzle and a vertical line of the metal plate
strip, of which the value range is 0<.beta.<50.degree..
10. The method for arranging jet cleaning nozzles according to
claim 1, wherein different kinds of mediums pass through the
nozzles simultaneously.
Description
TECHNICAL FIELD
[0001] The present invention relates to a jet flow cleaning
technology, especially relates to a method for arranging jet
cleaning nozzles, which is mainly used for conducting continuous
cleaning to corrosion layer and adhesion on the surface of cold
state hot-rolled steel sheets of different width specifications, so
as to ensure that the scale skin on the whole plate width can be
removed efficiently and partly scale skin remaining on the surface
can be completely eliminated when a strip steel of different width
specifications in a continuous descaling, so as to enhance the
flexibility and effect of the jet flow descaling.
BACKGROUND
[0002] When using jet flow to conduct descaling to the metal
surface, as the metal plate strip has a greater width value, it is
usually hard to cover the whole width when using single nozzle to
conduct rust removal or descaling, so a plurality of nozzles of the
same type and same geometrical fixing manner are continuously
arranged in a staggered manner in the widthwise direction of the
metal plate strip. Therefore, evenly distributed and steady
descaling can be achieved when the metal plate strip is passing
through the region covered by nozzles. While regarding to the
continuous descaling production line, in order to enhance the
descaling efficiency and ensure the continuous descaling, after
opening each roll of metal plate strip, usually conducting fast
welding between heads and tails of each roll to achieve a headless
metal plate roll with infinite length so as to always ensure
continuous feeding for follow-up process section. This kind of
technical manner can be called as continuous descaling (or
continuous metal surface processing).
[0003] This kind of continuous descaling, due to a certain
difference between width specification and thickness specification
of each plate roll, such as, an continuous acid-rolling line of a
steel company, whose steel plate width specification of incoming
materials is frequently switched between 550.about.1050 mm,
descaling stability of such frequently switched width value can be
easily assured with respect to traditional acid pickling descaling,
while it brings great influence regarding to using the jet flow
physical descaling technology. This influence is mainly embodied in
following aspects:
[0004] 1. Established number of the nozzles must take the widest
width specification as the object, and the nozzles need to be
arranged are numerous.
[0005] 2. When processing the plate strip of narrow specification,
nozzles positioned at side portions beyond the plate width will
still continue to spray, which causes great waste of electric
energy and water resource.
[0006] 3. The nozzles beyond the plate width are symmetrically
arranged on both sides of the plate strip, they will directly spray
to each other face to face when spraying; great spray force will
directly cause mutual damage to both of them, which will seriously
reduce the service life of the nozzle.
[0007] Based on above problems, different solving methods are
specifically designed in the prior art: such as a inclined
arranging manner used in Japanese patent JP55100814A, which aims to
conduct integral incline to the nozzle arranged on the whole width
surface based on widening or narrowing when the size specification
of the plate width is switched, so as to ensure that the cleaning
surface is wholly covered. However, this kind of arranging manner
has very strict requirements to the strength distribution of nozzle
jet flow, for the reason, after the inclined angle has changed, its
former evenly distributed strength rule is broken, and the strength
distribution characteristic of each nozzle is not able to strictly
satisfy the even distribution of strength while jet flow of each
nozzle does not interfere with each other when inclining different
angles.
[0008] There is also technical solution provided by the prior art
to aim at nozzle arrangement, such as conducting removal of hot
rolling scale skin, cooling of continuous casting and so on by
using high-pressure water, in which the nozzle arrangement mainly
uses traditional straight arranging manner with respect to the
largest width specification.
SUMMARY
[0009] The object of present invention is design a method for
arranging jet cleaning nozzles, according to which, the nozzles can
be flexibly controlled, and the efficient and continuous descaling
to the surfaces of metal plate strips that have different width
specifications and different requirements on the descaling speed
can be achieved based on the change of the geometric relationship
between nozzles. In this way, waste of energy and water resources
during switch of specifications is eliminated, and the phenomenon
that upper and lower nozzles spray to each other is also
eliminated, thereby achieving flexible and efficient control over
the arrangement mode of nozzles for descaling.
[0010] Specifically, a method for arranging jet cleaning nozzles,
multiple rows of nozzles are in a parallel manner and uniformly
arranged along the lengthwise direction of a metal plate strip, the
nozzles in each row are arranged at an equal interval, two adjacent
rows of nozzles are arrayed in a staggered manner along the
widthwise direction of the metal plate strip so as to form a nozzle
matrix; each nozzle is perpendicular to a moving direction of the
metal plate strip, and a perpendicular distance of each nozzle to a
surface of the metal plate strip is same.
[0011] Furthermore, mutual interference between jet flows of
adjacent nozzles in the same row does not happen.
[0012] Mutual interference between jet flows of two adjacent rows
of nozzles does not happen in a lengthwise direction of the metal
plate strip, that is, between front and rear nozzles.
[0013] In the widthwise direction of the metal plate strip, that is
a X direction, a separation distance between nozzles in each row is
2a; a separation distance between nozzles from two adjacent rows of
nozzles in a plate widthwise direction is a.
[0014] In a moving direction of the metal plate strip, that is a Y
direction, a separation distance between two adjacent rows of
nozzles is b, and a value of b should satisfy that there is
non-mutual interference between jet flows of two adjacent rows of
nozzles.
[0015] When a width of the metal plate strip in production line
changes and produces a metal plate strip of a certain target width
in a width range of cleaning, in order to assure that all nozzles
can conduct efficient descaling to the plate, the nozzle is
adjusted as follows:
[0016] in the a vertical direction of the a surface of the plate,
that is namely the a Z direction, the moving distance is .DELTA.c,
setting a direction close to the metal plate strip as negative
moving, the a value of .DELTA.c is a negative value in this
situation; a direction away from the surface of the plate is
positive moving, a Z value is a positive value in this situation;
so that, the calculation formula is:
.DELTA.c={[(L.sub.1-L.sub.0).times.ctg.alpha.]/n}(1+K)
[0017] in the formula:
[0018] L.sub.0--a basic width value of the metal plate strip,
mm;
[0019] L.sub.1--an adjusting target width value of the metal plate
strip, mm; [0020] .alpha.--as unilateral divergence angle of jet
flow symmetric section of the nozzle, which is determined by
properties of the nozzle, degree;
[0021] n--the number of nozzles of two adjacent rows; K--a
compensation coefficient of a jet flow characteristic of nozzles
-0.5.about.0;
[0022] in a vertical direction of the surface of the metal plate
strip, that is namely a Z direction, setting a moving distance as
.DELTA.c, setting a direction moving close to the metal plate strip
as a negative movement, wherein a value of .DELTA.c is a negative
value; setting a direction moving away from the surface of the
metal plate strip as a positive movement, a value of Z is a
positive value; wherein the following formula is satisfied:
.DELTA.a=(L.sub.1-L.sub.0)/(n-1).
[0023] Furthermore, the nozzles in each row are parellelly arranged
in more than one column along the lengthwise direction of the metal
plate strip, so as to form a longitudinal nozzle unit which can be
adjusted individually.
[0024] A jet flow divergence angle of the nozzle is:
0<.alpha.<45 .degree..
[0025] An axis of the nozzle is in a plane which is parallel to a
strip moving direction of the metal plate strip and vertical to the
surface of the metal plate strip; and an angle .beta. is between
the axis of the nozzle and a vertical line of the metal plate
strip, of which the value range is 0<.beta.<50 .degree..
[0026] Two kinds of mediums pass through the nozzle simultaneously,
one is liquid water, and the other is hard particles
[0027] After the metal plate strip of the widest specification
which needs to be cleaned has entered the jet flow descaling unit
in the present invention, the nozzle unit will be evenly disturbed
according to the cleaning surface strength distribution and the jet
flow affected range of each nozzle, which aims to cover the plate
width as large as possible, and ensure the jet flow between each
nozzle not to cause mutual interference in the widthwise direction,
namely the X direction; at the same time, being evenly disturbed
according to the cleaning strength distribution and the jet flow
affected range of each nozzle, the nozzle must give consideration
to the affected range and strength of other nozzles and the nozzles
in the front and rear row are arranged in a staggered manner.
[0028] Provided that the present invention is based on above kinds
of geometric positional changing rule, flexible switching for
different plate width specifications can be realized.
[0029] With respect to prior art, the present invention has
following advantages:
[0030] 1. The present invention uses a nozzle matrix, the whole
nozzle matrix can be flexibly controlled and always entirely cover
the surface of different plate width respectively, so that the
descaling section will not affect the production technology pace of
the upstream and downstream of the metal plate strip, which will
obviously enhance the productivity of the manufacturer.
[0031] 2. The present invention has eliminated the empty spray and
mutual spray of part of nozzles at side portions, which can
obviously enhance the service life of nozzles at side portions and
greatly reduce the waste of energy, and the production cost of
manufacturing enterprises can be directly reduced.
[0032] 3. The present invention is based on the strength
distribution rule of the nozzle itself, which is always premised on
the even distribution of strength of the plate width direction so
as to reasonably control the distance between the transverse and
longitudinal nozzles and spray target distance. It aims to reach a
highest cleaning efficiency of nozzles to any different plate width
on the production line.
BRIEF DESCRIPTION OF DRAWINGS
[0033] FIG. 1 is a top view illustrating the nozzle arrangement in
the embodiment of cleaning metal plate strip of wide specification
according to the method of present invention.
[0034] FIG. 2 is a side view illustrating the nozzle arrangement in
the embodiment of cleaning metal plate strip of wide specification
according to the method of present invention.
[0035] FIG. 3 is a view illustrating the distribution of the nozzle
spray strength in the embodiment of cleaning metal plate strip of
wide specification according to the method of present
invention.
[0036] FIG. 4 is a parameter diagram of the nozzle arrangement when
cleaning metal plate strip of narrow specification according to the
method of present invention.
[0037] FIG. 5 is a parameter diagram of the nozzle arrangement when
cleaning metal plate strip of narrow specification according to the
method of present invention.
[0038] FIG. 6 is a distribution diagram of the nozzle spray
strength when cleaning metal plate strip of narrow specification
according to the method of present invention.
[0039] FIG. 7 is a structure diagram between the nozzle and the
metal plate strip according to the method of present invention.
EMBODIMENTS
[0040] A method for arranging jet cleaning nozzles according to the
present invention, as shown in FIGS. 1-3, multiple rows of nozzles
are in a parallel manner and uniformly arranged along the
lengthwise direction of a metal plate strip 1. In the present
embodiment, each nozzle 21, 22 or 31, 32 in the first row of
nozzles 2 and the second row of nozzles 3 are arranged at an equal
interval. Two adjacent rows of nozzles are arrayed in a staggered
manner along the widthwise direction of the metal plate strip 1 so
as to form a nozzle matrix. Each nozzle is perpendicular to a
moving direction of the metal plate strip 1. The perpendicular
distance of nozzles 21, 22, 31, 32 to the surface of the metal
plate strip 1 is same.
[0041] Preferably, mutual interference between jet flows of
adjacent nozzles 21, 22 or 31, 32 in the same row does not happen;
and mutual interference between jet flows of two adjacent rows of
nozzles 2, 3 does not happen in a lengthwise direction (Y
direction) of the metal plate strip 1, namely that is, between two
adjacent nozzles 21, 32.
[0042] In the widthwise direction of the metal plate strip 1, that
is namely the X direction, a separation distance between nozzles
21, 22 in each row is 2a; the a separation distance of nozzles 21,
32 from two adjacent rows of nozzles 2, 3 is a.
[0043] Hereby cite the scale skin removal of the cold state
hot-rolled steel sheet surface as an example, of which the
embodiments are as follows:
[0044] A spray pressure of the nozzle is set at 30.about.80 MPa,
and a flow rate of each nozzle is at a level of 10 L/min.about.60
L/min.
[0045] Regarding to a cleaning for a strip steel with a width of
1000 mm, the first row of nozzles need to be arranged with 10
nozzles, the second row of nozzles also need to be arranged with 10
nozzles, and a offset distance between two nozzles is 50 mm; a
spray distance Z of the nozzle is kept at a level of 120 mm to
spray.
[0046] A jet flow divergence angle .alpha. of each nozzle is
30.degree., of which the strength distribution obeys the normal
distribution rule, as shown in the FIG. 3. Wherein, S1 is the
strength of the first row of nozzles, S2 is the strength of the
second row of nozzles, and S0 is a strength distribution after
overlapping two rows of nozzles. By such arrangement and adjusting
manner of the nozzle matrix, a fast switching to a steel plate of
another width can be realized after descaling of a whole surface of
the steel plate of one certain width, and the descaling of a whole
surface of the steel plate after switching can also be realized,
which will greatly enhance the service efficiency of each nozzle
and eliminate the waste of useless jet flow spray and other
phenomenon.
[0047] As shown in FIGS. 4-6, when the width value of the strip
steel being in cleaning is switched from original 1000 mm to 500
mm, a variation rules of the a, b, c value of each nozzle are as
follows:
.DELTA.c={[(500-1000).times.ctg15]/20}(1+K)
.DELTA.c=-75 mm
[0048] in the formula: K--a jet flow influence coefficient of a
nozzle, just take "-0.2".
[0049] At the moment, a spray target distance of a nozzle of narrow
specification is changed into:
c=120-75=45 mm
[0050] Similarly, it can be calculated that the value of a, b after
adjustment is:
.DELTA. a = 1 2 [ ( 500 - 1000 ) ( 10 - 1 ) ] = - 27.78 mm
##EQU00001## .DELTA.b=0 mm
[0051] In this way, it is realized that the nozzle matrix unit is
switched from a cleaning manner of 1000 mm to a cleaning manner of
500 mm. During this period, there is no need to conduct any
adjustment to the pressurized system, pipeline and so on, which
greatly enhances the technical control ability and improves the
production efficiency.
[0052] As shown in FIG. 1, said nozzles in each row are arranged in
a parallel manner in more than one column along the lengthwise
direction of the metal plate strip 1 (Y direction), so as to form a
longitudinal nozzle unit 4 which can be adjusted individually.
[0053] As shown in FIG. 7, a axis of said jet nozzle 21 (citing the
jet nozzle 21 as an example, other are the same) is AB line, and a
direction of the jet flow is: from A to B; the direction of the jet
flow AB within a plane ACEF parallel to a strip moving direction of
the strip steel (the metal plate strip 1) and vertical to the
surface of the metal plate strip; and there is an included angle
.beta. between the axis of the nozzle 21 (AB line) and a vertical
line AC of the metal plate strip 1, of which the value range is
0<.beta.<50.degree..
[0054] The present invention fully uses the jet flow characteristic
and the strength distribution characteristic of the nozzle, so as
to realize a swift adjustment of the nozzle matrix when cleaning
the metal strip plate surface. Especially, it can enhance the
surface cleaning efficiency of the metal strip plate, decrease
unnecessary loss of energy and greatly reduce abnormal damage of
partial device. Therefore, the present invention has wide
application prospect in the field of surface descaling technology.
The present invention is not only adapted to the surface descaling
and rust removal of cold state metal strip plate, but also can be
applied to technical field of coating, nozzle cooling, spray
lubrication, etc.
* * * * *